Arithmetic Assignment Operators #

You may have noticed that sometimes you need to write an assignment statement that uses the current value of the variable being assigned to. For example:

x = x + 1

You can write this a bit more concisely, as x += 1. You can actually do this with any arithmetic operator on a numeric variable:

x = 10
x += 5  # x is 15
x //= 3  # x is 5
x **= 2  # x is 25

The += operator also work with strings:

s = "sp"
s += "am"  # s is "spam"